|What is the make and model of external memory card reader, or if it's built into your brand name system, what is the make and model of the brand name system ?|
In most cases, when it's built into the computer's case or connected externally, a card reader is a device connected via a USB connection.
An external card reader must be plugged into a USB port that it will work with properly.
If you were able to read data on the same memory card in the same memory card reader previously but you can't do that now, you probably caused that problem yourself and usually that problem can be fixed.
Troubleshooting USB device problems including for flash drives, external drives, memory cards.
See Response 1:
You usually don't need to install third party drivers for a card reader in XP- it will use generic drivers already built into Windows.
Older memory card readers cannot read newer higher capacity memory cards - they're not detected at all - there's nothing you can do about that, other than buying a newer memory card reader.